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Have you search on forum before posting this question.this is the most common question asked by every newbie here and relatively answered 100 times per week.always googling first and if still your homework is not achiving reults,post question here.
Learn to use this magic link http://forums.remote-exploit.org/search.php
For working that adapter always attach it after properly booting of bt3.second try injection test with
aireplay-ng -9 rausb0
if it says injection is working,well and fine.if not then lower the injection rate by using
iwconfig rausb0 rate 1M
retest using the aireplay command and it should work now.

i dont know if i have fix the problem
but i did all what you say ,i have the same probem some time good, some time bad
i don't know exactly what the steps i did after that ;
then i don't have any problem with my wifi (i can scan normally with airodump)
(i unplug my wifi ,i make it down ,i put it in monitor mode...)
then finally it is good
if any one help me please exactly what i should type from the beginning (updating my driver ... to using airodump-ng) and if you can tell me if i should unplug my wifi in any step
thank you very much
and excuse me about my english...